Magnetic recording apparatus



Get. 4, 1949. L. a. GREENLEAF MAGNETIC RECORDING APPARATUS Filed Dec.

Patented Oct. 4, 1949 Leland B. Greenleaf, Elkhart. Ind., Elkhart, 1nd,, 9.

C. G. Conn, Ltd., of Indiana assignor to corporation Application December 1, 1944, Serial No. 566,108

9 Claims. (01. 242-54) This invention relates to magnetic recording apparatus and more particularly to a reel or spool construction for detachable connection to a magnetic recorder or reproducer.

One of the objects of the invention is to provide a magnetic recording apparatus in which a reel or spool may be quickly and easily attached to and detached from the apparatus and in which wire carried by the spool is fully covered and protected when the spool is detached from the apparatus.

Another object is to provide a spool for magnetic recording apparatus in which wire on the spool is covered by a simple cover strip engaging the spool flanges.

Still another object is to provide magnetic the spools. The take'ups-reel I is permanently attached to the apparatus while the supply reel may be quickly attached to and detached from the apparatus by sliding it over the shaft M, a spring detent l1 being provided yieldingly to hold the reel on the shaft.

recording apparatus in which a cover strip on a spool is opened and held away from the spool during operation of the apparatus.

A still further object is to provide magnetic recording apparatus in which the apparatus is controlled to start at the same time that the cover on the spool is disengaged therefrom.

The above and other objects and advantages of the invention will be more readily apparent from the following description when read in connection with the accompanying drawing, in which- Figure 1 is a partial sectional view illustrating one form of apparatus embodying the invention;

Figure 2 is a partial plan view of a recording apparatus;

Figure 3 is a partial plan view of the apparatus with the spool removed; and r Figure 4 is a partial section of an alternative construction.

The apparatus as shown in Figure 2 may be utilized for making recordings magnetically on wire or for reproducing previously made recordings from the wire. In the apparatus illustrated, a casing or housing In is adapted to contain a driving motor as well as various electrical devices such as amplifiers, speakers or the like. The motor drives a driving pulley ll over which a wire i2 passesvto be driven by the pulley at a substantially constant speed. The wire iscarried by a supply spool l3 detachably mounted on a central shaft l4 and is wound on a take up spool l5 beneath and concentric with the supply spool l3. The take up spool is carried by a sleeve I6 concentric with the shaft H. The shafts l4 and it are driven during operation of the apparatus thru a friction driving mechanism or the like, which will permit slight variations in the shaft speed to compensate for the changing reel diameters as the wire is wound onto or unwound from that when it engages Wire unwound from the reel l3 passes thru a level wind guide l8 over an idler pulley IS. The wire then goes thru a recording or reproducing head 20 and over the driving pulley H. After leaving the driving pulley II the wire passes over a second guide pulley 2| which is held against the wire by a spring 22 to maintain it under substantially constant tension. A second level wind device 23 guides the wire onto the take up spool it. An indicator 24 may be provided geared to one of the shafts M or It to indicate the length of wire which has been fed thru the machine.

In order to cover and protect wire on the supply spool l3 when it is detached from the machine, a resilient cover strip 25 is provided which is adapted to encircle the spool IS. The cover strip may be made of any desired material but is preferably of spring steel or the like and is normally of a smaller diameter than. the reel so that it will engage tightly against the flanges on the reel. As shown, circumferential grooves 26 may be provided adjacent the edges of the cover strip to fit over the reel flanges and hold the strip firmly in place thereon. The strip is of such a length the reel its ends will overlap slightly and one end or the strip is rolled back on itself as indicated at 2'Ito provide a transversely extending eye or socket.

In order to move the cover strip away from the spool when it is on the apparatus the apparatus carries a series of bell crank levers 28 pivoted at their centers. One arm of each bell crank lever carries at its outer end an upwardly extending pin or button 29 adapted to engage the lower edge of the cover strip 25 when the spool is placed on the apparatus. One bell crank lever as shown at 3| is formed with its legs at a different angle than those of the levers '28 and carries at the outer end of one arm an elongated pin 32 adapted to enter the socket 21 when the spool is placed on the carry the pins 29 when these ends of the levers are in their innermost positions, The plate 33 may be turned by a handle 36 extending therefrom V in a position to be engaged by an operator. 1 f

the spool than the other levers move. This pro vides a relatively large gap betweenthe endsof reel shafts the strip thru which the wire can pass. Due to the engagement of the 'pi n=32.with the socket; 21,

are accurately positioned so always be properlylocated .After the wire on the t on the levers will be moved inwardly thereby per mitting the cover strip to re-enga'ge the flanges requiring opening of the cover The motor for driving the to the handle 36 so that when the handle is turned to open the cover on the reel, the motor ill be started. This insures that before starting the motor the cover is properly opened so that the wire will not be broken.

Figure 4 illustrates an alternative arrangement invention, reference being had for this'purpose to'the appended claims. What is claimed is: 1. A reel structure for use with a magnetic recording apparatus comprising a flanged spool adapted to be detachably mounted on the ap- -2. In combination with a magnetic recording apparatus; a flangedspool, means on the apthe spool on can turn relative to the strip.

3'. In combination with a magnetic recording apparatus, a flanged spool, means on the apparatus for detachably mounting the spool on the apparatus engagepoints in the length mounted able with the strip at spaced the spool is fit into the socket,

levers simultaneously to move the strip away from the spool.

5. In combination mounted on the apparatus and adapted to fit into the sockets when the spool is mounted on the apparatus, and means to move the pins outward to move the strip away from the s ol.

6. In combination with a magnetic recording apparatus, a flanged spool,

apparatus, an elongated cover strip fitting around the spool and engaging the flanges, parts on the apparatus engageable with the strip at spaced points in its length when .the

to control operation of the apparatus,

the moving means and the control means to start the apparatus when the strip is moved away from the spool.

7. In combination with a magnetic recording on the apparaapparatus, an elongated resilient cover strip fitting around the spool and resiliently biased into engagement with the spool flanges, the ends 01' to turn themeans on the appara-' 5 the strip overlapping when it is in place on the spool and one of the ends being formed with a socket, levers on the apparatus engageable with the strip at spaced points'in its length when the spool is mounted on the apparatus, a pin on one of the levers to fit into the socket, and means 1 to move the levers simultaneously to move the strip away from the spool.

9. A reel construction for use with a. magnetic recording apparatus comprising, a. flanged spool adapted to be detachably mounted on the apparatus, and an elongated resilient cover strip fit- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Number 7 1,304,021 Carter. May 20, 1919- 1,468,636 Hoeft Sept. 25, 1923 2,111,776 Hogan Mar. 22, 1938 2,191,849 Debrie T Feb, 27, 1940 FOREIGN PATENTS Number Country Date Germany Dec. 2, 1932 

